TRANE Air Conditioner/heat Pump(outside Unit) Manual L0905021
User Manual: TRANE TRANE Air conditioner/heat pump(outside unit) Manual TRANE Air conditioner/heat pump(outside unit) Owner's Manual, TRANE Air conditioner/heat pump(outside unit) installation guides
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18-BC50D1-2
Pumps
4TWX3; 4"[3NX4
ALL phases
of this installation
IMPORTANT
-- This Document
pack upon completion of work.
must
comply
is customer
with
NATIONAL,
property
and is to remain
These instructions
do not cover all variations
in
systems
nor provide
for every possible
contingency
to
be met in connection
with installation.
All phases of
this installation
must comply
with NATIONAL,
STATE
AND LOCAL CODES. Should further information
be
desired or should particular
problems arise which are not
covered sufficiently for the purchaser's
purposes, the matter
should be referred to your installing dealer or local distributor.
A. GENERAL
The following instructions
Units.
STATE AND LOCAL
with this unit.
UNiT CONTAINS
CODES
Please
return
to service information
R-410A REFRIGERANT!
R-410A OPERATING
PRESSURE
EXCEEDS THE
LIMIT OF R-22. PROPER SERVICE EQUIPMENT
IS
REQUIRED.
FAILURE TO USE PROPER SERVICE
TOOLS MAY RESULT IN EQUIPMENT
DAMAGE OR
PERSONAL
INJURY.
cover 4TWX3; 4TWX4 Heat Pump
SERVICE
USE ONLY R-410A REFRIGERANT
APPROVED
POE COMPRESSOR
NOTICE:
These outdoor units may be used with indoor units
equipped with Thermostatic Expansion Valve or
A ccutron TMFlow Con trol Check Valve (F. C. C. V.) assembly
for refrigerant flow control only.
AND
OIL.
5 FT. ABOVE UNIT=UNRESTRICTED
These units use R-410A refrigerant which operates at 50 to
70% higher pressures than R-22. Use only R-410A approved
service equipment. Refrigerant cylinders are painted a "Rose"
color to indicate the type of refrigerant and may contain a
"dip" tube to allow for charging of liquid refrigerant into the
system. All R-410A systems use a POE oil that readily absorbs
moisture from the atmosphere. To limit this "hygroscopic"
action, the system should remain sealed whenever possible. Never break a vacuum with air and always change the
driers when opening the system for component replacement.
Check for transportation
damage after unit is uncrated.
Report promptly, to the carrier, any damage found to the unit.
To determine
the electrical power requirements
of the unit,
refer to the nameplate
of the unit. The electrical power
available must agree with that listed on the nameplate.
The Weathertron
®Heat Pump has been designed and
manufactured
to withstand
and operate in severe winter
conditions. However, there are precautionary
steps which
should be taken at the time of installation
which will help
assure the efficient operation of the unit. It is recommended
that these precautions
be taken for units
being installed
in areas where snow accumulation
and
prolonged
below freezing
temperatures
occur.
1. Units should be elevated 3 to 12 inches above the pad or
rooftop, depending on local weather. This additional
height will allow better drainage ()[:'snow and ice (melted
during defrost cycle) prior to its refreezing. This should
prevent a build-up of ice around the unit which occurs
when unit is not elevated. Insure
that drain holes in
unit base pan are not obstructed
preventing
draining
of defrost water.
2,
If possible, avoid locations that are likely to accumulate
snow drifts. If not possible, a snow drift barrier should be
installed around the unit to prevent a build-up of snow
on the sides of the unit and should be of sufficient
distance from the unit to prevent restriction of airflow to
and from the unit. Also allow for proper maintenance
space. The barrier should be constructed
of materials
which will blend in with the building design.
|nsta||er's
@
Guide
BASEPAN
7. If outdoor unit is mounted above the air handler, maximum lift should not exceed sixty (60) fhet (suction line).
If air handler is mounted above condensing unit, maximum lift should not exceed sixty (60) feet (liquid line).
TAB REMOVAL
rREMOVE_
8. Locate and install indoor coil or air handler in accordance with instruction
included with that unit.
TABS AS I
_SHOWN)
C. ACCUTRON
TM
FLOW CONTROL
VALVE
If the indoor unit System Refrigerant
Flow control is an
Accutron TM orifice and check valve assembly, an orifice size
change may be necessary.
The outdoor model determines
the required orifice size.
Check the listed orifice size on nameplate
of the selected
outdoor model. If the indoor unit is factory shipped with a
diffhrent orifice size, the orifice must be changed to obtain
system rated performance.
3. Avoid locating the unit where condensation
and freezing
of defrost vapor may annoy the customer. For instance,
installing the unit under a bedroom, kitchen, or picture
window may be annoying to the customer since condensate and fog will occur during the defrost cycle.
4. Avoid locating the unit under the eaves or other overhead structures
as sizeable icicles may form and the unit
may be damaged by these falling icicles.
B. LOCATION AND PREPARATION
OF THE UNiT
1. When removing unit from the pallet, notice the tabs on
the basepan. Remove tabs by cutting with a sharp tool as
shown above in Figure 2, and slide unit off of pallet.
2. The unit should be set on a level support pad at least as
large as the unit base pan, such as a concrete slab. If this
is not the application
used please refer to application
bulletin "Trane APB2001-02".
3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12" from
any wall or surrounding
shrubbery
to insure adequate
airflow. Clearance must be provided in front of control
box (access panels) and any other side requiring service
access to meet National Electrical Code. Also, the unit
location must be far enough away from any structure
to
prevent excess roof run-off water from pouring directly
on the unit. Do not locate unit(s) close to bedroom(s).
4. The top discharge area must be unrestricted
five (5) feet above the unit.
for at least
BRAZE
TYPE iNDOOR
END
SEALING
CAP
IMPORTANT:
The outdoor unit is shipped with the proper size orifice and a
stick-on orifice size label in an envelope attached to the outdoor
unit. Outdoor unit nameplate wi// have correct orifice size
specified as BA YFCCV --- A for rated performance.
D. iNSTALLiNG
REFRIGERANT
ifusing existing refrigerant
are brazed, not soldered.
Condensing
units
LINES
lines make certain that all joints
have provisions
for braze connections.
Pressure taps are provided on the service valves of outdoor
unit for compressor suction and liquid pressures.
The indoor end of the recommended
refrigerant
line sets may
be straight or with a 90 degree bend, depending upon
situation requirements.
This should be thoroughly checked
out before ordering refrigerant
line sets.
The gas line must always
5. When the outdoor unit is mounted on a roof, be sure the
roof will support the unit's weight. Properly selected
isolation is recommended
to prevent transmission
to the
building structure.
6. The maximum length of refrigerant
lines from outdoor
indoor unit should NOT exceed sixty (60) feet.
NOTE:
Attach R-410A CAUTION Label (located in documentation
package) to access panel of indoor section.
be insulated.
In scroll compressor applications, dome temperatures may
be hot. Do not touch top of compressor, may cause minor
to severe burning.
to
The units are fhctory charged with the system charge
required when using fifteen (15) feet of connecting line. Unit
nameplate
charge is the same.
©
LiQUiD LiNE SERVICE VALVE
ROLLED
_%_XFLOW
_
oo
TO
CONTROL
CAP-_=--
CHECKVALVE
/
EDGE
(F,O,O.V,)
UNIT
ORIFICE
SIDE
@
/
OF
_
CAPTIVATE
_
STEM
REX HEADED
SERV'CE ;STEM
SERVICE
PORT
_[_
MOULD
FIELD
LINE
SUPPLIED
© 2005 American Standard inc. All Rights Reserved
-_
k_'
/
--
/
LIQUID LINE
CONNECTION
18-BC50D1-2
|nstaI|er's
@
tap service port (when depressed) opens only to the field
brazing side when the valve is in the closed position.
GAS LINE SERVICE VALVE
cAp-___
The Gas Line Service Valve is full open with a 1/4 turn.
Figure 5.
BRAZING REFRIGERANT LINES
1. Remove lower access cover to access service valves.
V4TU_NONLY
COUNTERCLOCKWISE
FORFULLOPEN
I _,PosmoN
OFVALVE
2,
Before brazing, remove plugs from external
tubes. Clean internal and external surfaces
prior to brazing.
3,
Cut and fit tubing,
bends.
P_ESSU_ETAPPORT
4. Insulate
minimizing
Final refrigerant
charge adjustment
is necessary.
the Charging Charts in the outdoor unit Service Facts.
2. Consider
the most practical
Use
way to run the lines.
types of bends to be made and space limitations.
NOTE:
Large diameter tubing will be very difficult
has been shaped.
to rebend once it
3. Determine the best starting point for routing the refriger_mt tubing -- INSIDE OR OUTSIDE THE STRUCTURE.
4. Provide a pull-thru hole of sufficient
liquid and gas lines.
5. Be sure the tubing
is of sufficient
size to allow both
length.
6. Uncoil the tubing -- do not kink or dent.
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to
vibration transmission
from the refrigerant
lines, the
following precautions
should be taken:
a. When the refrigerant
lines have to be fastened to floor
joists or other framing in a structure,
use isolation
type hangers.
b. Isolation hangers should also be used -when refrigerant lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant
lines run through
they should be insulated
and isolated.
a wall or sill,
d. Isolate the lines from all ductwork.
E. SERVICE
VALVE OPERATION
BRASS LIQUID LINE SERVICE VALVE
The Brass Liquid Line Service Valve is factory shipped in the
scald position to hold factory charge. The pressure tap service
port (when depressed) opens only to the field brazing side of
the valve when the valve is in the seated position. The liquid
line valve is not a back seating valve (see WARNING below).
Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn valve stem counterclockwise only until the stem contacts the rolled edge. (See
Figure 4) No torque is required.
BRASS GAS LINE SERVICE VALVE
The Brass Gas Line Service Valve is shipped in the closed
position to hold the factory refrigerant
charge. The pressure
18-BC50D1-2
See
copper stub
of stub tubes
the use of sharp
90 °
the entire gas line and its fittings.
5. Do NOT allow uninsulated
contact with bare gas line.
1. Determine
Guide
liquid line to come in direct
6. Precautions
should be taken to avoid heat damage
to the pressure
tap valve core during
brazing.
It is
recommended
that the pressure
tap port valve
core be removed
and a wet rag wrapped
around
the valve body.
NOTICE:
Use care to make sure that no moisture
port, while wet rag is being used.
enters pressure
tap
NOTICE:
Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the
flame directly off of the basepan.
7. Use a Dry Nitrogen Purge and Brazing Alloy without
flux when brazing the field line to the copper factory
connection. Flow dry nitrogen into either valve pressure
tap port, thru the tubing and out the other port while
brazing.
8. Braze using accepted
good brazing
techniques.
LEAK CHECK
IMPORTANT:
Replace pressure tap port valve core before attaching hoses for
evacuation.
After the brazing operation of refrigerant
lines to both the
outdoor and indoor unit is completed, the field brazed
connections must be checked for leaks. Pressurize
through
the service valve ports, the indoor unit and field refrigerant
lines with dry nitrogen to 350-400 psi. Use soap bubbles or
other leak-checking
methods to see that all field joints are
leak-free! If not, release
pressure;
then repair!
SYSTEM EVACUATION
NOTE:
Since the outdoor unit has a refrigerant
liquid line valves must remain closed.
charge, the gas and
1. Upon completion of leak check, evacuate the refrigerant
lines and indoor coil before opening the gas and liquid
line valves.
2. Attach appropriate
hoses from manifold
and liquid line pressure taps.
gauge to gas
NOTE:
Unnecessary switching of hoses can be avoided and complete evacuation of all lines leading to sealed system can
be accomplished
with manifold center hose and connecting branch hose to a cylinder of R-410A and vacuum pump.
3
|nstaI|er's
3. Attach
center
4. Evacuate
until
350 microns.
Guide
hose
the
of manifold
micron
gauges
gauge
to vacuum
reads
pump.
no higher
than
5. Close offvalve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in
one (1) minute, then evacuation
is incomplete or system
has a leak.
6. The use of color coded low voltage wire is recommended
to simplify connections between the outdoor unit, the
thermostat
and the indoor unit.
Table 1 -- NEC Class II Control Wiring
24 VOLTS
WIRE
6. If vacuum gauge does not rise above 500 microns in
one (1) minute, the evacuation should be complete.
7. With vacuum pump and micron gauge blanked oft, open
valve on R-410A cylinder and charge refrigerant lines and
indoor coil with vapor to tank pressure of R-410A supply.
NOTE:
DO NOT VENT REFRIGERANT
INTO THE ATMOSPHERE.
8. Close valve on R-410A supply cylinder. Close valves on
manifold gauge set and remove refrigerant
charging
hoses from liquid and gas pressure tap ports.
NOTE:
A 3/16" Allen wrench is required to open liquid line service
valve. A 1/4" Open End or Adjustable wrench is required to
open gas line valve. A 3/4" Open End wrench is required to
take off the valve stem cap.
9. The liquid line shut-offvalve
can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stem
and backout counterclockwise
until valve stem just
touches rolled edge (approximately
five [5] turns)
observing WARNING
statement
on page 2. See Figure 4.
10. Replace liquid service pressure tap port cap and valve
stem cap. These caps MUST BE REPLACED
to
prevent leaks. Replace valve stem and pressure tap cap
finger tight, then tighten an additional
1/6 turn.
11. The gas valve can now be opened. Open the gas valve by
removing the shut-off valve cap and turning the valve
stein 1/4 turn counterclockwise,
using 1/4" Open End or
Adjustable wrench. See Figure 5.
12. The gas valve is now open for refrigerant
flow. Replace
valve stem cap to prevent leaks. Again, these caps
MUST BE REPLACED
to prevent leaks. Replace valve
stem and pressure tap cap finger tight, then tighten an
additional 1/6 turn. See Figure 5.
If refrigerant
lines are longer than 15 f_et and/or a different
size than recommended,
it will be necessary to adjust system
refrigerant
charge upon completion of installation.
See unit
Service Facts.
F. ELECTRICAL
CONNECTIONS
When installing or servicing this equipment, ALWAYS
exercise basic safety precautions to avoid the possibility
of electric shock.
1. Power wiring and grounding
with local codes.
of equipment
2. Power supply must agree with equipment
3. Install
4. Ground
a separate
the outdoor
disconnect
must
comply
8,
MAX. WIRE
LENGTH
18 AWG
150 FT
16 AWG
225 FT.
14 AWG
300 FT.
Table i defines maximum total length of low voltage
wiring from outdoor unit, to indoor unit, and to
thermostat.
Mount the indoor thermostat
in accordance with instruction included with the thermostat.
Wire per appropriate
hook-up diagram (included in these instructions).
G. DEFROST
CONTROL
The demand defrost control measures heat pump outdoor
ambient temperature
with a sensor located outside the
outdoor coil. A second sensor located on the outdoor coil is
used to measure the coil temperature.
The difference between
the ambient and the colder coil temperature
is the difference
or delta-T measurement.
This delta-T measurement
is
representative
of the operating state and relative capacity of
the heat pump system. By measuring the change in delta-T,
we can determine
the need for defrost. The coil sensor also
serves to sense outdoor coil temperature
for termination
of
the defrost cycle.
FAULT iDENTiFICATiON
A fault condition is indicated by the flashing light on the
defrost control inside the heat pump control box.
In normal operation, the defrost control light will flash once
each second. If the light is flashing more than once per
second or not at all, refer to the service manual for that unit.
PIN IDENTIFICATION
(See Figure 6.)
1. TEST_COMMON
(Shorting any of the other pins to this
pin causes the function of the other pin to be executed.
Leaving this pin open results in the normal mode of
operation.)
2. TST = Test (Shorting TESTCOMMON
speeds up all defrost board timings.)
to this pin
3. FRC_DFT
= Forced Defrost (Short TEST COMMON
this pin for two (2) seconds to initiate a forced defrost.
Remove the short after defrost initiates.)
®
to
PiN iDENTiFiCATiON
Z
0
0
o I
nameplate.
switch at the outdoor
unit.
unit per local code requirements.
5. Provide flexible electrical conduit whenever vibration
transmission
may create a noise problem within the
structure.
4
7,
SIZE
LOW FAN
18-BC50D 1-2
|nsta||er's
4. LOW_FAN = Low speed Fan test mode (Short
TEST_COMMON
to this pin to force the outdoor fan to
low speed. When the short is removed, the fan will go to
high speed for approximately
15 seconds and then
return to the speed it was running before the short was
applied.)
DEFROST CONTROL CHECKOUT
Normal operation requires:
a. LED on board flashing
R &B
c. 24V AC between
Y & B with unit operating
when FRC_DFT
pin.
If a defrost control problem
information
in control box.
is suspected,
pin is shorted
to
refer to the service
ODS=A
START UP
TYPICAL
A, Fi J:,,NDLEi
'_---'R
K. START CONTROL
Some models have quick start components which are fhctory
installed. For models that do not have factory installed start
components,
provisions are made for a field installed start kit
accessory. When adding an accessory, follow the instructions
provided with the kit.
L. OUTDOOR
THERMOSTAT
An outdoor thermostat
TAYSTAT250A may be field installed.
For data, see wiring diagram attached to unit and instruction
sheet packaged with outdoor thermostat.
After all electrical wiring is complete, SET THE THERMOSTAT SYSTEM SWITCH IN THE OFF POSITION SO
COMPRESSOR
WILL NOT RUN, and apply power by
closing the system main disconnect switch. This will activate
the compressor sump heat (where used). Do not change the
Thermostat
System Switch until power has been applied for
one (1) hour. Following this procedure will prevent potential
compressor overload trip at the initial start-up.
'S iAT
HEATERS
Electric heaters, if used, are to be installed in the air handling device according to the instructions
accompanying
the
air handler and the heaters.
Do NOT connect 24 VAC to T1 (ODS=A) terminal.
thermistor WILL BE BLOWN.
H. COMPRESSOR
AND CHECKOUT
Final phases of this installation
are the unit Operational
and
Checkout Procedures which are found in this instruction
on
page 8. To obtain proper performance,
all units must be
operated and charge adjustments
made in accordance with
procedures found in the Service Facts.
J. ELECTRIC
I time/second.
b. 24V AC between
d. Defrost initiation
TEST_COMMON
I. OPERATIONAL
PROCEDURES
Guide
M. SEA COAST SALT SHIELD
All units are shipped with a black Sea Coast Salt Shield
attached to the access panel. Removal of the shield -will
potentially shorten the life of the joints in the outdoor coil.
FIELD HOOK=UP DIAGRAMS
hiITA i I>U'vlI>
VARIABLE SPEED
AIR HAND!_R
T'STAT
NEAT PUMP
Fq
D
Fq
@
J
D_---0
BK(X2,)
Fq
k_
;
- I--D-
i
_
II,
'N /
ii = -..
..
....
F"
--;/..-.7-
0
u
_--',iR(
---
_._o.P
_._o._
A.Z..R
E___0
TEL
Fq
D
I.....
..... i3
-_._.ri
"
)
NOTE 6
_q\---
BR(T)
L....
q!bT
) F_O,
i5 5RgO/,l/0[_
PRINTED
FROM B}52934P04
Notes:
LEGEND
1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. ODT-B must be set lower than ODT-A.
,5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
6. N/A to programmable thermostat.
18-BC50D1-2
.....
FACTORY WIRING
FIELD WIRING
5
|nsta||er's
Guide
S[RViC£
RANF_ ...................
£ {T
CA A b
FIG
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ARANC S
i_i_ P_EVAii
i_6 ¢0i)F8
AN[
UNi J SilOULD RE PLACE[} SO ROOF
FinN OFF gAII!R OOES NO1 POUR
DiRECFLY
ON UNII,
AND SHOUiD BE
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50!i (12 _' } FROM WAtJ AND Air
SURROUNDING SIIRUBBERY ON iWO SIDES
OFH[R IWO SID[S
UNR[STRiCIE8
222
22
MODELS
BASE
{//8)
DIA
iOW VOt]A(iE
286
(illS)
DiA
K 0
8 (7/8)
DiA
HOL_ iN CON]RO[
BOX 80TTOM fOR _ECTRICAL
POW{R SUPPLY
D
E
J
K
4TWX3018A
3
1016 (40)
829 (32-5/8)
756 (29-3/4)
1/2
1/4
143 (5-5/8)
92 (3-5/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX3024A
3
1016 (40)
829 (32-5/8)
756 (29-3/4)
5/8
5/16
143 (5-5/8)
92 (3-5/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX3030A
3
1016 (40)
829 (32-5/8)
756 (29-3/4)
3/4
5/16
143 (5-5/8)
92 (3-5/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX3036A
4TWX3042A
3
1219 (48)
829 (32-5/8)
756 (29-3/4)
3/4
3/8
143 (5-5/8)
92 (3-5/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX3048A
4
1064 (41-7/8)
946 (37-1/4)
870 (34-1/4)
7/8
3/8
152 (6)
98 (3-7/8)
219 (8-5/8)
86 (3-3/8)
730 (28-3/4)
4TWX306OA
4
1165 (45-7/8)
946 (37-1/4)
870 (34-1/4)
7/8
3/8
152 (6)
98 (3-7/8)
219 (8-5/8)
86 (3-3/8)
730 (28-3/4)
4TWX4024B
3
1219 (48)
829 (32-5/8)
756 (29-3/4)
5/8
5/16
143 (5-5/8)
92 (3-5/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX403OB
3
1219 (48)
829 (32-5/8)
756 (29-3/4)
3/4
5/16
143 (5-5/8)
92 (3-6/8)
210 (8-1/4)
79 (3-1/8)
692 (27-1/4)
4TWX4036B
4
1165 (45-7/8)
946 (37-1/4)
870 (34-1/4)
3/4
3/8
152 (6)
98 (3-7/8)
219 (8-5/8)
86 (3-3/8)
730 (28-3/4)
4TWX4042B
4
1267 (49-7/8)
946 (37-1/4)
870 (34-1/4)
3/4
3/8
152 (6)
98 (3-7/8)
219 (8-5/8)
86 (3-3/8)
730 (28-3/4)
4TWX4048B
4TWX406OB
4
1267 (49-7/8)
946 (37-1/4)
870 (34-1/4)
7/8
3/8
152 (6)
98 (3-7/8)
219 (8-5/8)
86 (3-3/8)
730 (28-3/4)
A
B
C
F
G
H
From Dwg. 21D152635
6
Rev. 11
18-BC50D 1-2
|nsta||er's
MOUNTING
Guide
HOLE LOCATION
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).
33
( 3 19)
A
72_ (869
............................................
482 : I8 99 : .......................................
:}99 (?3
f8)
BASE 3
158 (6.24)
DRILL
4 PLACES
795 (3
717 (28.24)
T
317
.28)
(12.48)
l
23
(8.39)
O
599 (23.58)
NOTE: For model base size,
see table on page 6.
127 (28.64)
BASE 4
From Dwg. 21D152637
18-BC5OD1-2
Rev. 1
7
|nstaI|er's
Guide
CHECKOUTPROCEDURE
After installation
1. Refrigerant
2. Suction
has been completed,
Line, Leak checked
Lines and Fittings
it is recommended
that the entire system
..................................
properly
insulated
...........
3. Have all Refrigerant
Lines been secured and
isolated properly? ........................................................
[
]
[
]
[
4. Have passages through masonry been sealed?
If mortar is used, prevent mortar from coining
into direct contact with copper tubing ........................
[
5. Verify tightness
[
of all electrical
connects
...................
6. Observe outdoor fan during on cycle for clearance
and smooth operation ..................................................
[
7. Indoor coil drain line drains freely. Pour water
into drain pan ..............................................................
[
TROUBLESHOOTING
]
]
be checked against
the following list:
8. Supply registers and return grilles open and
unobstructed
................................................................
[
]
9. Return
[
]
10. Thermostat
thermometer
is accurate. Check
against a reliable thermometer.
Adjust per
instructions
with thermostat
......................................
[
]
11. Is correct speed tap being used?
(Indoor blower motor) ..................................................
[
]
12. Operate complete system in each mode to
insure safe operation ...................................................
[
]
CHART
air filter installed
............................................
m WHAT TO CHECK
SYSTEM
FAULTS
REFRIGERANTCIRCUIT
Head Pressure
Too High
s
s
Head Pressure
Too Low
P
P
EtlctionPressureTooHigh
EtlctionPressureTooLow
LiquidHeDig Floodback(TXV)
DE _p
LE Coil Frosting
s
s
P
P
s
P
p
s
P
p
ELECTRICAL
Coml_ressor& OO Fan
Won't Start
s s
s s
CompressorWill Nol Start
But OO Fall Runs
OE FanWon't Start
i
Com#ressof Hums ButWon't Start
S
S
S
S
ss
PP ;
Com#ressof Cycleson EOI.
EE Blower Won't Start
S S
DEFROST
UnitWon't Dlitiate Defrost
DefrostTerminateson Time
Unit EcingUp
C - Cooling
H - Heating
P - PrimaryCauses
S - SecondaryCauses
'k - 3 PhaseOnly
P.I.
I"I!t,IN£
Trane
A business of
American Standard Companies
www.trane.com
Trane has a policy of continuous product and product data improvement
design and specifications without notice.
and it reserves the right to change
02/05
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